if you think you are still getting gas into your cooling system after pressure test, why havent you tested the system for gas content?

It may not necessarily be combustion gas is what i am saying. By analyzing it and seeing exactly what make up of fumes is in the system it would point me to the part of the system that has that gas type in it. For example like Crankcase fumes or combustion or just oxygen in the case of a cracked head or skmething of the sorts.

It may not necessarily be combustion gas is what i am saying. By analyzing it and seeing exactly what make up of fumes is in the system it would point me to the part of the system that has that gas type in it. For example like Crankcase fumes or combustion or just oxygen in the case of a cracked head or skmething of the sorts.

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Well, if the metal expands to reveal a small crack you cant really test the coolant system while hot unless you hooked up the air compressor to the expansion tank nipple thing. I'm not sure if it would push up on the cap to allow pressure in the system though.